Hi Vijay,
Thank you for using Syncfusion Products.
Currently we don't have the controls like ‘WindowsFormsHost’ in our Controls List and we are unable to reproduce the issue mentioned in the update. We used WindowsFormsHost in our Tileview Control with UserControl no such resizing issue was reproduced and Please refer the attached sample. Still if you able to reproduce the issue with the sample, please contact us via Direct-Trac .So that we can provide the solution at the earliest.
Please let us know if you have any queries.
Regards,
Sakthi
WindowControlIntegration_3709f33f.zip